I think Starmer has been excellent so far.. He is moving labour back to the centre left where it should be, and suspending Corbyn will undoubtedly lead to Momentum members resigning from the party which will only be good in the long term.
More likely they will crawl back into the woodwork, from whence they came, and wait for better (for them), times. Their presence though has been a wake up call, and not just to The Labour Party, that if you let the grass roots organisation slip you CAN be taken over.